Most articles and TV woodworking shows insist that you MUST laminate both
sides of any material when you laminate. What is the rationale for
laminating BOTH sides of plywood? If I am using Baltic ply (or apple ply)
and I apply a thin (1/8"-1/4") veneer to only one side only, what damage
could arise. How does a sheet of 13 ply Baltic know another ply has been
attached.??

30-40 years ago we were able to purchase "lumber core" plywood. Certainly a
lumber core construction would require that both sides be laminated for
obvious reasons.

John